Abrasive tool



Feb. 27, 1934. F. E. BERTRAND ABRASIVE TOOL Filed May 23, 1933 N/E/VTU Rm 8 W Patented Feb. 27, 1934 UNITED STATES PATENT OFFICE ABRASIVE TOOL Application May 23, 1938. Serial No. 672,460

9 Claims.

This invention relates to an abrasive tool and is herein illustrated as embodied in a shoe bottom scouring roll. The most commonly used type of bottom scouring roll consists of a solid roll body covered with a layer of felt which serves to cushion an abrasive cover. Mounted in the roll body and extending along the length of the felt-covered roll, there are usually provided a plurality of hooks for clamping the abrasive cover against the felt backing. Where greater softness and resilience are desired than can be afforded by the usual felt backing, it has been proposed to employ an expansible element such as an inflatable sleeve for supporting the abrasive cover. However, such an arrangement presents a difficulty in that the inflatable sleeve or other expansible element does not provide a suitable foundation to which clamping hooks can be secured.

It is an object of the present invention to provide an improved arrangement for securing an abrasive cover upon an expansible tool body.

In accordance with a feature of the invention, the abrasive cover which is to surround the roll 'body has loops formed upon its respective meeting ends, and a rod is inserted through the loops to retain the abrasive cover upon the roll body. In the illustrated tool, the roll body consists of I a sleeve of resilient inflatable material and has formed in its exterior surface a recess to receive such a retaining rod.

The above and other features of the invention, including details of construction and arrangement of parts, will now be more particularly described with reference to the accompanying drawing, in which Fig. 1 is a view in front elevation of an infla able bottom scouring roll provided with the improved arrangement for securing an abrasive cover;

Fig. 2 is a sectional view taken on the line II--II of Fig. 1;

Fig. 3 is a fragmentary plan view of the abrasive cover, and

Fig. 4 is a sectional view similar to Fig. 2 showing a modified form of abrasive cover retaining device.

The roll shown in Fig. 1 is mounted upon a I shaft 10, one end of which is supported for rotation in a bearing 12. The shaft is tubular, having a bore 14. Within the bearing 12 is formed an air duct 16 which communicates with the open end of the bore 14. In order to prevent leakage of air, the bearing 12 is formed to con- 5,5..Istitute a stufling box within which is a ring of packing material 18 surrounding the shaft 10. A nut 20 threaded into the stufling box serves to compress the packing material 18. The bore 14 terminates short of the opposite end of the shaft 10, which opposite end may be supported in any type of bearing ordinarily used in machines of this character. Secured upon the shaft 10 by a pin 22 at a locality adjacent to an end of the shaft is a hub 24 having a disk-shaped flange 26. A set of similar members, also identified by the reference characters 22, 24 and 26, respectively, are mounted upon the shaft at a distance from the first-mentioned set of members which is approximately equal to the length of an ordinary bottom scouring roll. An inflatable sleeve 28, which preferably is composed of rubber, has formed in each of its ends an inwardly turned flange 30. The sleeve 28 is mounted upon the disks 26 and each of the flanges 30 is clamped against its respective disk 26 by means of a clamping disk 32 which extends from a hub 34 threaded upon the outer end of its, respective hub 24. Each of the clamping disks 32 has formed upon it a nurled ring 36 to facilitate tightening and loosening. Formed in the shaft 10 are a plurality of openings 38 through which air under pressure may pass from the bore 14 to the interior of the sleeve 28.

Surrounding the sleeve 28 is an abrasive cover 40 which, when flat as shown in Fig. 3, has a pair of parallel ends in oblique relation to its sides. Formed upon the oblique ends of the cover 40 are a plurality of loops 42. These loops are preferably formed of the material of the abrasive cover itself and, as in the illustrated cover, they consist of tabs folded back upon themselves and cemented to the under side of the cover 40 with the abrasive material on the outside. The tabs 42 upon one end of the cover are in staggered relation to the tabs 42 upon the opposite end of the cover when the cover is mounted upon the sleeve 28, as indicated in Fig. 1. When the abrasive cover is wrapped about the sleeve 28, the tabs 42 upon one end will thus interengage with the tabs 42 upon the opposite end, and a flexible rod 44 threaded through all the loops holds the two ends of the cover together and maintains the cover in position upon the sleeve 28. The rod 44 preferably consists of a fiat fibre strip stiffened with pyroxylin, though it may be formed of any other suitably flexible material. The cover 28 preferably has molded in it a recess 46 to accommodate the strip 44 and the additional thickness of the abrasive cover surrounding it. In Fig. 4 is shown a modification wherein a wire 48 is employed in place of a fiat strip. The wire 48 is formed of resilient metal, such as piano wire. A somewhat deeper but narrower groove 50 is molded in the sleeve to accommodate the wire 48.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A finishing roll comprising a roll body, a finishing cover surrounding said roll body and having loops upon its meeting ends respectively, and a rod extending through said loops to retain the finishing cover upon the roll body.

2. An abrading roll comprising a roll body, an abrasive cover surrounding said roll body and having a plurality of loops upon each of its .meeting ends, the loops upon one end of theabrasive cover being staggered in relation to the loops upon the other end, and a rod extending through all of said loops to retain the abrasive cover upon the roll body.

3. A finishing roll comprising an expansible roll body, a finishing cover surrounding said roll body and having a plurality of loops formed upon each of its meeting ends, the loops upon one end of thefinishingcover being staggered in relation to the loops upon the other end, and a rod extending through all-of said loops to retain the finishing cover upon the roll body, said roll body being recessed to accommodate said rod.

4. An abrading roll comprising an inflatable roll body, an abrasive cover surrounding said roll body and having a .plurality of loops formed upon each of its meeting ends, the loops 'upon one end of the abrasive cover being staggered in relation to the loops upon the other end and the meeting ends of the .abrasive cover being disposed helically in relation to the roll body, and a flexible rod extending through all of said loops to retain the abrasive cover upon the roll body.

5. An abrading roll body comprising a sleeve of resilient inflatable material for supporting an abrasive cover, and a rotary member constructed and arranged to supportsaid sleeve and to admit air under pressure into the interior of said sleeve, said sleeve having formed in its exterior surface a permanent recess to receive a rod for maintaining an abrasive cover upon the sleeve.

6. An abrasive cover comprising a sheet of abrasive material having loops formed upon its ends for receiving a retaining rod.

7. An abrasive cover comprising a sheet of abrasive material having loops for receiving a retaining rod, said loops being formed by tabs integral with:and extending from the body portion of the sheet material.

8. A finishing cover comprising a sheet of abrasive material having loops upon two of its ends for receiving a retaining rod, the loops upon one end being arranged to enter into staggered relation with the loops upon the opposite end when the abrasive cover is wrapped abouta roll body.

9. A finishing cover comprising a sheet of abrasive material having two parallel sides and two parallel ends in oblique relation to the'sides and having also a plurality of loops formed upon each of said ends, the loops upon one end being arranged to enter into staggered relation with the loops on the other end when the cover is wrapped upon a roll body with the ends meeting in a helix upon the roll body.

FREDERIC -E. BERTRAND. 

